Spray gun



Oct. 13, 1936. F. I. JADE-N ET AL SPRAY GUN Filed May 31, 1934 2Sheets-Sheet 1 \lllll FRE MA DEN 4nd ARTHUR fi/e/voLp Oct. 13, 1936. -F.l. JADEN ET AL SPRAY GUN Filed May 31, 1954 2 Sheets-Sheet 2 FRED I wt/A.DE N and flRTHUR -B.ARNOLD Patented Oct. 13, 1936 UNITED STATES SPRAYGUN Fred I. Jaden and Arthur B. Arnold, Hastings, Nebr.

Application May 31, 1934, Serial No. 728,436

2 Claims.

This invention relates to spray guns. It has for its object theprovision of a trigger actuated gun adapted to be connected to andderive its fluid pressure from the standard type of hose commonlyemployed at automobile servicing stations.

The invention concerns itself particularly with means for securing thecoupling of the air hose with adjustable tension to the gun in fluidtight manner yet with sufficient freedom to permit the gun to beoscillated to the right or left in the act of spraying withoutnecessitating bending of the air hose.

Another object of the invention is to provide the gun handle with asocket or recess for the coupling having a clamp for holding it in placeand a projecting nipple adapted to enter the coupling and serving thedual purpose of opening the air valve in the air line and serving as anaxis for the relative rotation of the gun with respect to the hose.

Still another object of the invention is the provision in a spray gun ofa nozzle constructed to cause the impingement of laterally directed airjets against a jet emanating from acentral tube, said nozzle beingadjustably orientable for changing the direction of the flat spraywithout altering the longitudinal relation of the lateral jets to thecentral tube.

Other objects of the invention will appear as the following descriptionof a preferred and practical embodiment thereof proceeds.

In the drawings which accompany and form a part of the followingspecification and throughout the several figures of which the samecharacters of reference have been employed to designate identical parts:

Figure l is a vertical elevation partly in section of a spray gunembodying the salient features of 40 our invention;

Figure 2 is a front view of the nozzle;

Figure 3 is a vertical section through the nozzle and the adjacentportion of the spray gun;

Figure 4 is a horizontal section taken along the 45 line 4 4 of Figure1, looking up;

Figure 5 is a side elevation partly in section showing a modified formof the invention; and

Figure 6 is a side elevation partly in section of the handle of a spraygun illustrating a further 50 modification;

Referring now in detail to the several figures and first adverting tothat form of the invention shown in Figures 1, 2 and 3, the numeralrepresents the spray gun body which is suitably fitted 55 to the screwcap 2 adapted to screw on the mouth of a jar 3. The body I has a boss 4projecting through an aperture in the cap 2 and secured by means of asuitable washer 5 and lock nut 6. A gasket 1 is preferably providedbetween the top 60 of the jar and the inside of the cap to preventleakage. The cap 2 is provided with an air vent passage 8 whichcommunicates with the interior of the jar through alined apertures 9 andIn in the cap and gasket respectively. A pin projecting from the lowerface of the body through the cap 2 and into the gasket 1 determines theinitial alinement of theparts. The air vent passage 3 preferably openson the opposite side of the jar to that having the apertures 9 and I0 soas to prevent the paint or other liquid in the jar from spilling throughthe vent should the jar be overturned or tilted to an extreme positionas when spraying a ceiling.

The body of the spray gun has a bore l2 preferably extending along itsvertical axis, into which is screwed a tube H to a point adjacent thebottom of the jar for drawing up the liquid to be sprayed. The body isprovided also with a pas sage M communicating with the bore l2 andcommunicating with a fine bore l5 extending longitudinally through aspray head l6 screwed or otherwise secured to the working end of thebody A needle valve ll controls the rate of flow of the liquid throughthe passage It. Said needle valve screws against the tension of a springl8 which prevents it inadvertently changing its adjustment.

The body is provided with an air passage l3 which extends also throughthe handle 20, being interrupted at an intermediate point by a ballvalve 2| urged to closing position by a spring 22. A nut 23 screwingagainst the spring affords an adjustable tension for the valve. Thevalve is opened by a plunger 23 normally kept out of contact with thevalve 2| by means of a spring 25 under compression between a shoulder 26on the wall of said passage and a collar 21 on the plunger. The plungeris slidably mounted in a removable plug 28, and has an extending end 29adapted to be engaged by the finger operated trigger 30. When so engagedthe plunger moves inwardly against the tension of the spring 25,contacts with the ball valve 2| lifting it against the tension ofthe'spring 22 and opening the passage l9. The portion of the passagewhich passes through the handle 20 terminates in a nipple 3| projectingslightly beyond the face 32 of the recess or cleft 33 formed in thelower part of the handle 20. Said recess is large enough to admit thecoupling or chuck 3d of the air hose 35. When the air hose is in placethe projecting end of the nipple 3| enters the cylindrical mouth of saidcoupling and forms an axis about which the spray gun can turn. Thecoupling is held in tight relation against the face 32 by a thumb screw36 threaded through an aperture 20' in the handle 2|] and engaging theback of the coupling 34. The thumb screw 36 may be adjusted so as topress the coupling against the face 32 with enough pressure to assure afluid tight joint and yet with insufiicient pressure to til prevent theoscillation of the spray gun relative to the hose in the act ofspraying, the coupling swiveling around the projecting end oLthe nipple3| in the manner described, the hose being able to pass freely throughthe open sides of said chuck.

The working end of the body of the spray gun is externally threaded asat 31 for the reception of a ring nut 38 having an inwardly extendingflange 39 at its inner end. The adjacent end of the body of the spraygun is provided with a circumferential rabbet 40 forming a shoulder uponwhich seats the flanged edge 4| of the spray nozzle 42. The outer sideof said flanged edge is formed as a shoulder 43 by means of whichthenozzle 42 is retained beneath the flange 39 of the ring nut. The nozzle42 may be screwed tightly against the body I so as to fix it in anyposition of orientation. Said nozzle has a chamber 44 at its inner endcommunicating with the air passage I9, and having inclined ports 45 and46 communicating with said chamber and with the flared opening 47 whichforms the mouth of said nozzle. When the nozzle is in place, the end ofthe spray head l6 projects slightly into the mouth 41. The inclinedports 45 and 46 are on opposite sides of the end of the spray head andtheir eifect is to flatten the jet of liquid issuing from said sprayhead. By loosening the ring nut and turning the nozzle 42 to any desiredangular position, the plane of the flat spray may be rotated about theaxis of said nozzle.

While in our co-pending application Serial No.-

698,516, filed November 17, 1933, we disclosed a means for rotating thenozzle so as to angularly shift the plane of the flat spray, yet in saidapplication the adjustment was accomplished by screwing the nozzle on oroiT, which necessarily changed the relation of the outer end of thespray head I to the ports 45 and 46. By the use of the ring nut,rotation of the nozzle can be accomplished without changing itslongitudinal relation to the spray head.

An adjustable needle valve 48 controls the air flow to the nozzlechamber 44. In the form of our invention shown in Figure 1, the handleand body are united by conventional means such as the threadedconnection 49.

It is obvious that when the coupling of the air line has been screwedinto a fluid tight position as illustrated in Figure 1. the projectingend of the nipple 3| has pushed back the valve of said coupling and thecontrol of the air admission to the body of the spray gun is a functionof the valve 2|.

Figure 5 illustrates a modified form of the invention to the extent thatthe handle is clampably secured to the body portion both to makemechanical connection and at the end an airtight joint between the partsof the air passage IS in the body portion and handle. In this form ofthe invention the handle terminates in a socket 50 connected to thehandle by a threaded nipple 5|. The socket member has a concave seat 52in the face of which the portion of the passage IS in the handle opens.The body portion l of the spray gun has a nipple 53 screwed in the endthereof having a bore forming part of the passage IS, the end of saidnipple being convex to correspond to the concave seat in the socket 5D.

A nut and lock nut 54 and 55 respectively, are threaded on the nipple 53and a'clamp hook 56 suitably secured to the handle has its bifurcatedend 51 straddling the nipple behind the nut and engaging the latter. Byscrewing up the nut 54 against the clamp hook, the end of the nipple isburied into the seat of the socket sufflciently to produce a fluid tightjoint while at the same time rigidity is imparted to the connectionbetween the body of the spray gun and the handle. In other words, thenuts 54 and 55 are adjustable on nipple 53 to vary the tension of theclamp hook in holding the nipple to its seat 52. This variable springtension enables the operator to connect the handle to, or disconnect itfrom, the spray gun, merely by inserting the convex end of the nipple inthe seat 52 and rocking the handle about said seat.

In this form of the invention the valve 2| and its appurtenant operatingelements are similar to those described in connection with Figure 1excepting that the trigger 58 extends downwardly along the handleinstead of upwardly and its amplitude of actuation is determined by aspring pressed plunger 59, the end 60 of which projects into contactwith the trigger. A set screw 6| presses against a cap 62 on the end ofthe spring and can be screwed in or out to regulate the tension of thespring, adjusting the resistance of the trigger to the comfort of theindividual hand.

Figure 6 shows still another form of the invention, the distinctivefeature being the means for holding the coupling of the air hose intooperative position, which instead of being a thumb screw as in the firstdescribed form of the invention is a pivoted jaw 63 forming part of thehandle. The end 64 of the jaw embraces the head of the coupling bearingupon it substantially in the axis, produced, of the nipple 3|. Thepressure of the jaw is regulated by means of a set screw 65 threadedinto said jaw and which may be screwed in or out.

While we have in the above description defined what we believe to be apreferred and practical embodiment of our invention, it will beunderstood by those skilled in the art that the details of constructionas illustrated and described are merely by way of example and not to beconstrued as limiting the scope of the invention as claimed.

What we claim is:

1. Flexible joint for an air conduit comprising a member having a cleftin its end opening on two lateral sides and its rear side, giving accessto an air hose chuck, a nipple projecting from one wall of said cleftbeing the terminus of a conduit passing through said member, said nippleforming a pivot joint adapted to enter the nozzle of the air hose chuckfor swivelly connecting the same to said member and opening the aircheck valve in said chuck, and clamping means at the opposite wall ofsaid cleft positioned to apply pressure to said air hose chucksubstantially in line with the axis of said nipple, for sealing saidchuck against leakage while permitting the air hose to swing through theopen sides of said cleft.

2. Flexible joint as claimed in claim 1, said clamping means including amovable clamping jaw constituting the side of said cleft opposite saidnipple.

FRED I. JADEN. ARTHUR B. ARNOLD.

